Single tool 'dynamic_marketplace_tools' has critical definition gaps. Tool name lacks action verb (should be 'call_marketplace_api' or 'invoke_endpoint'). Description is generic and does not explain WHAT the tool does operationally, it describes the marketplace concept rather than the tool's behavior. Input schema present but minimal: only 'path' and 'query' strings with basic descriptions. No output schema documented. No error handling guidance. No parameter constraints (enums, ranges, formats). Tool appears to be a catch-all proxy rather than a well-defined, composable tool. Per Arcade pattern:tool, tool names must start with action verbs and descriptions must state WHAT, WHEN, and prerequisites. This tool fails both.

• Rename tool to 'call_marketplace_endpoint' or 'invoke_paid_api' to signal the action clearly.
• Rewrite description: 'Call a registered API endpoint from the StellarPay402 marketplace. Automatically handles x402 payment on Stellar testnet. Returns the endpoint response (JSON or text). Use this to access any registered paid API without managing payments manually.'
• Document output schema: 'Returns {status: number, data: any, headers: object, paymentTxHash?: string}' or actual structure.
• Add parameter constraints: 'path: optional URL path segment (alphanumeric, /, -, _; max 256 chars). query: optional query string (URL-encoded; max 512 chars).'
• Add error handling: 'If payment fails, error includes reason (insufficient balance, invalid address, network error). If endpoint times out, retry with exponential backoff. If endpoint not found, list available endpoints.'